The page also comes provided with example Images and Example Metadata so you can understand the proper format for uploading Images and Metadatas to the project

Upload Level Images: You can upload a set of images that will (by name) automatically be added to an Upgrade project as a set of levels

Upload Level Metadata: You can alternatively upload a set of Metadatas that will (also by name) automatically be added to the project as a set of levels

Example Images: This downloadable contains a set of images in the proper format one can use to upload a batch of images into the upgrade system as a new set of levels in the proper way

Example Metadata: This downloadable contains a set of metadatas in the proper format one can use to upload a batch of images into the upgrade system as a new set of levels in the proper way